Proper noun
A placename: The largest port city of Peru.
A placename: A province and district therein, in Peru.
A placename: A place in the United States: A minor city and inactive township in Macon County, Missouri.
A placename: A place in the United States: An unincorporated community in Juab County and Tooele County, Utah.
A placename: A place in the United States: An unincorporated community in Northumberland County, Virginia, revised from Callaway, the preferred name.
A placename: Several locations in Spain
A placename: A cave in Luzon, Philippines; in full, Callao Cave.